after summarizing the main points, I'd also like to clarify the
following I caught from this thread of exchange:
there are about 10 times fewer active AS numbers than there are active
prefixes. So flat-routing on AS numbers would gain one order of
magnitude
immediately.
I've seen similar statement several times by now. I suppose people
understand that routing on AS numbers *alone* is not a feasible
solution.
ASes come in all size and colors. Some AS could be a small company;
some other AS can cross multiple continents. So AS does not represent
a granularity suited for today's routing needs. Routing on ASes can
get one reachability, but not performance, load balance, traffic
engineering etc etc.
(Had we only cared reachability, I bet the DFZ table would not have
grown so big)
......
Well, until people drop the stupidity of reverse DNS lookup as a
"security check" it's very hard to drop this. Of course it's bogus.
I agree that different opinions exist regarding the use of reverse DNS
lookup, the degree of its effectiveness etc. But it is undeniable
that it has been a useful checking in many cases.
And we should not overlook its merit: it got adopted quickly and
widely because it made use of an existing function.
Lixia
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